Marner was more effective 2-7-9 points in the playoffs in 2017-18 as a teenager on his ELC playing against Boston playing alongside Bozak and JVR (before Tavares), then he was as a 27 year old 1-2-3 points playing alongside Matthews in 2023-24 against Boston again, this time without Selke Patrice Bergeron for Bruins,
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Part of that reason was coach Babcock believed in a balanced TOP 9 and created mismatches for the opposition to handle.
Keefe believed putting all his eggs in one basket and pairing Marner with Matthews, draws the opposition best defenders & top Dman pairing and that keeps the top players in check.